- A
- B
- C
- D
Step-by-Step Solution
→ cm. TSA = . Trap , the lateral surface area (four walls only). Trap : the area of one face. Trap : multiplying the VOLUME by 6 instead of finding the edge first — that also leaves the wrong units.
Answer: A)
A cubical box encloses a volume of . Find its total surface area.
Class 8MensurationMensuration
Key idea: Surface area and volume of a cylinder
A cylinder is a circle stacked vertically. Two measurements: radius and height .
**Curved surface area (CSA) = 2π** (imagine 'unrolling' the curved surface — it becomes a rectangle of width 2π and height h).
**Total surface area (TSA) = 2πππ** (curved surface + two circular ends).
**Volume = π** (area of circular base × height).
Use π = 22/7 when is a multiple of 7; otherwise π ≈ 3.14.
**Curved surface area (CSA) = 2π** (imagine 'unrolling' the curved surface — it becomes a rectangle of width 2π and height h).
**Total surface area (TSA) = 2πππ** (curved surface + two circular ends).
**Volume = π** (area of circular base × height).
Use π = 22/7 when is a multiple of 7; otherwise π ≈ 3.14.
Master this chapter in 30 minutes a day.
Don't just memorise the answer — build a daily practice habit.
Practice 5 Similar Questions Free →All Mensuration practice questions
More Class 8 Mensuration practice
The curved surface area of a cylindrical pillar is 264 m² and its radius is 3 m. Find…A closed cylindrical drum has a diameter of 28 cm and a height of 10 cm. Find the total…A cylindrical water tank that is open at the top has radius 7 m and height 4 m. Its…The curved surface of a cylinder of radius 7 cm and height 12 cm is cut open along its…A hall has 12 cylindrical pillars, each of radius 0.35 m and height 5 m. Painting the…